1 files changed, 19 insertions, 7 deletions

diff --git a/gl/m4/netinet_in_h.m4 b/gl/m4/netinet_in_h.m4
index d73531a..096be74 100644
--- a/gl/m4/netinet_in_h.m4
+++ b/gl/m4/netinet_in_h.m4
@@ -1,18 +1,30 @@
-# netinet_in_h.m4 serial 1
-dnl Copyright (C) 2006 Free Software Foundation, Inc.
+# netinet_in_h.m4 serial 3
+dnl Copyright (C) 2006-2007 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-dnl Written by Simon Josefsson
-
 AC_DEFUN([gl_HEADER_NETINET_IN],
 [
-  AC_CHECK_HEADERS_ONCE([netinet/in.h])
-  if test $ac_cv_header_netinet_in_h = yes; then
+  AC_CACHE_CHECK([whether <netinet/in.h> is self-contained],
+    [gl_cv_header_netinet_in_h_selfcontained],
+    [
+      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <netinet/in.h>], [])],
+        [gl_cv_header_netinet_in_h_selfcontained=yes],
+        [gl_cv_header_netinet_in_h_selfcontained=no])
+    ])
+  if test $gl_cv_header_netinet_in_h_selfcontained = yes; then
     NETINET_IN_H=''
   else
     NETINET_IN_H='netinet/in.h'
+    AC_CHECK_HEADERS([netinet/in.h])
+    gl_CHECK_NEXT_HEADERS([netinet/in.h])
+    if test $ac_cv_header_netinet_in_h = yes; then
+      HAVE_NETINET_IN_H=1
+    else
+      HAVE_NETINET_IN_H=0
+    fi
+    AC_SUBST([HAVE_NETINET_IN_H])
   fi
-  AC_SUBST(NETINET_IN_H)
+  AC_SUBST([NETINET_IN_H])
 ])